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Susan Burgmaier -5- March 20, 2014 <br />and moisture content during the regular compaction testing, but it does not appear <br />that strength properties, such as cohesion and angle of internal friction have been <br />determined for input into the stability analyses. Please reevaluate the stability of <br />Gob Pile #2, considering the material strength properties under the current <br />practice of blending fill material with refuse. <br />BOW2: Until recently access to gob pile #2 has been limited due to winter conditions. <br />BRL commits to conduct strength testing on the blended material at gob pile #2 and <br />will incorporate the results into future stability analyses. <br />18. Unconsolidated - Undrained tests were conducted on samples of coal mine waste <br />collected in 2005 and 2006. No additional UU tests have been done since. Three <br />Consolidated - Undrained tests were performed on coal mine waste collected in <br />2005. If (see item 13, above) there is a need to reincorporate Undrained <br />conditions into stability analyses, then updated UU and CU tests need to be <br />performed on coal mine waste blended with coverfill material. <br />BOW2: Please see HBET's response in attached document, section 3.2. <br />General Note: <br />The drying area on top of gob pile #2 will not be limited to the winter months only, gob <br />will be end dumped and allowed to dry before final placement and compaction. The <br />HBET stability analyses demonstrates that piles of uncompacted coal mine waste that <br />do not exceed 25' in height will be considered stable and not affect the overall stability <br />of gob pile #2. Please see revised pages 12 and 18. <br />Please fee free to contact me if you have any questions. <br />Sincerely, <br />Tamme Bishop, P.E. <br />Project Engineer <br />Enclosures: <br />Volume IX: Pages 12 -19, Table of Contents <br />HBET Stability Analysis <br />CC: Marcia Talvitie, DRMS - Durango (electronically) <br />Bill Bear, Bowie Resources, LLC (electronically) <br />Paonia Public Library <br />Bureau of Land Management (electronically) <br />US Forest Service (electronically) <br />